BEST MCQs TYPE QUESTIONS (WITH SOLUTIONS) OF TOPIC ALTERNATE
CURRENT (PHYSICS)
FOR NEET, JEE AND BOARD EXAMS
TOTAL QUESTIONS =10
Q1. The peak value of 220 volts of ac mains is
(a) 155.6 volts (b) 220.0 volts (c) 311.0 volts (d) 440 volts
Q2. If instantaneous current is given by 𝑖 = 4cos (𝜔 + 𝜙) amperes, then the r.m.s
value of current is
(a) 4 amperes (b) 2√2 amperes (c) 4√2 amperes (d) Zero amperes
Q3. In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is
(a) 400 volts (b) 323 volts (c) 300 volts (d) 340 volts
Q4. In an ac circuit 𝐼 = 100 sin200𝜋t. The time required for the current to achieve
its peak value will be
(a) 1/100 sec (b) 1/200 sec (c) 1/300 sec (d) 1/400 sec
Q5. The peak value of an alternating e.m.f. 𝐸 is given by 𝐸 = 𝐸0 cos 𝜔𝑡 is 10
volts and its frequency is 50 Hz. At time 𝑡 = 1/600 sec, the instantaneous e.m.f. is
(a) 10 V (b) 5√3 V (c) 5 V (d) 1 V
Q6. A generator produces a voltage that is given by 𝑉 = 240 sin120𝑡, where 𝑡𝑡 is
in seconds. The frequency and rms voltage area
(a) 60 Hz and 240 V (b) 19 Hz and 120 V (c) 19 Hz and 170 V (d) 754 Hz and 70 V
Q7. The output current versus time curve for a rectifies is shown in the figure.
The average value of output current in this case is
CURRENT (PHYSICS)
FOR NEET, JEE AND BOARD EXAMS
TOTAL QUESTIONS =10
Q1. The peak value of 220 volts of ac mains is
(a) 155.6 volts (b) 220.0 volts (c) 311.0 volts (d) 440 volts
Q2. If instantaneous current is given by 𝑖 = 4cos (𝜔 + 𝜙) amperes, then the r.m.s
value of current is
(a) 4 amperes (b) 2√2 amperes (c) 4√2 amperes (d) Zero amperes
Q3. In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is
(a) 400 volts (b) 323 volts (c) 300 volts (d) 340 volts
Q4. In an ac circuit 𝐼 = 100 sin200𝜋t. The time required for the current to achieve
its peak value will be
(a) 1/100 sec (b) 1/200 sec (c) 1/300 sec (d) 1/400 sec
Q5. The peak value of an alternating e.m.f. 𝐸 is given by 𝐸 = 𝐸0 cos 𝜔𝑡 is 10
volts and its frequency is 50 Hz. At time 𝑡 = 1/600 sec, the instantaneous e.m.f. is
(a) 10 V (b) 5√3 V (c) 5 V (d) 1 V
Q6. A generator produces a voltage that is given by 𝑉 = 240 sin120𝑡, where 𝑡𝑡 is
in seconds. The frequency and rms voltage area
(a) 60 Hz and 240 V (b) 19 Hz and 120 V (c) 19 Hz and 170 V (d) 754 Hz and 70 V
Q7. The output current versus time curve for a rectifies is shown in the figure.
The average value of output current in this case is
